Truing-tool holder for grinding-machines.



W s. DAVENPORT.

TRUING TOOL HOLDER FOB. GRINDING MACHINES.

APPLICATION FILED APR. 18, 1910.

1,1 10,424. Patented Sept. 15,1914,

- I1 Nil-NIB."

\ I fivewir:

purine STATES PATENT onrron.

WILLIAM 'S. DAVENPORT, OF NEW IBEDFOBD, MASSACHUSETTS, ASSIGNOR T MORSE TWIST DRILL & MACHINE COMPANY, OF NEW BEDFORD, MASSACHUSETTS, A COR- PORATION OF MASSACHUSETTS.

Specification of Letters Patent.

Patented Sept. 15, 1914:.

Application filed April 18, 1910. Serial No. 556,047.

To all whom it may concern:

Be it known that 1, WILLIAM S. DAVEN" Pour, a citizen of the United States, residing at New Bedford, in the county of Bristol and State of Massachusetts, have invented certain new and useful Improve ments in Truing-Tool Holders for Grinding-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled .in the art to which it appertains to make and use the same.

The invention relates to devices for truing the grinding wheels of plain or universal grinding machines such as are used for grinding cylindrical surfaces, and in which the work is supported upon centers and rotated while the point of operation of the grinding wheel is transferred along the work by reciprocation of either the grinding wheel or the work support.

During the operation of machines of this character the surface of the grinding wheel frequently becomes glazed or untrue, so that it is necessary to cut away the surface of the wheel b meansof a diamond point or truing tool 1n orderthat' the wheel may operate properly 'upon the work. The devices which have heretofore been employed for holding or suppporting the truing tool have been so constructed and arranged that it has been necessary -;to either remove the work from the centers, readjust the machine so as to allow an increased travel of the work support past the wheel, or to move the wheel out of grinding relation with the work, and with certain constructions all'of these changes or adjustments must be made,

in order to true the grinding wheel. After 40 th wheel has been trued the parts mustrbe then readjusted to bring thewheel and work into proper grinding relatiom'andtofl secure the proper relative travel oflthework and wheel. These changes in the adjustments of the machine render the truing of the wheel inconvenient, and also involve aloss of time;

and consequent reduction mtheproductmn of the machine.

It is accordingly the object of-the pres.

ent invention to provide means for truing the grinding wheel without removing the work from the centers or materially changing the adjustment of the machine. To this end the invention contemplates the provi- .sion in a grinding machine for grinding cylindrical work of a truing tool holder having PIOVISIOII' for engaging the-truing tool with th grinding wheel while the wheel, and without any adjustment of the The tool may grinding wheel carriage. then be caused to travel across the surface of the wheel, and adjusted to cut away and true its surface. After the wheel has been trued, it is merely necessary to advance the grinding wheel to thework to compensate for the amount it has been-trued, and then go.

on with the grinding operation. The specific construction and arrangement of the truing tool holding device is not material to the invention in its broader scope. In the simplest and most efiicient form of the invention which I have yet devised, however, the truing tool is secured in a carrier which.may be readilyswung into and out of working position without disturbing the work or the adjustment of the grinding wheel, and which is provided with an adjusting or operating device for regulating theaction of the tool upon the wheel.

The various features of the invention will be readily understood from the accompanying drawin s and the following detailed description o the construction shown therein.

In the drawings Figure 1 is a plan view illustrating so much of a plain grinding machine as is necessary to show theapplicaing the devices for holding the truing tool in elevation; and Fig. 3: is a sectional detail of the truing. tool carrier.

'tion of the present invention thereto; Fig. I .2 is a transverse sectional elevation showa bed 5 which is reciprocated to transfer the point of operation of the grinding wheel 6 along the work. The grinding wheel is mounted in a carriage 7 which is moved transversely to bring the grinding wheel into grinding relation to the work, and to feed the wheel forward as the grinding operation progresses. The parts thus far described may be of any well-known construction, and cooperate in the usual and wellknown manner to efi'ect the grinding.

The devices for truing the grinding wheel consist of a carrier 8 in whlch a diamond .tool 9 of the usual construction is -rigidly secured by a clamping screw 10. The tool carrier is mounted upon the work supporting table 4: in such manner that the tool may be readily brought into engagement-with the grinding wheel or ma be moved back out ofworking posltion. is shown, the carrier is pivoted at 11 to a base 12 which is secured upon the ways 18 by a clamping plate 14 and bolt 15. The base 12 is provided with an arm 16, and the tool carrier is provided with an adjusting screw 17 adapted'to engage the upper sideof' the arm when the carrier is swung into working position. During the grinding operation the tool carrier is swing back into the position indicated in full lines in Figs. 1 and 2 where it is out of working position. When it is desired to sharpen or true the grinding wheel the tool carrier is swung forward into the posi-. tion indicated in dotted lines in Fig. 2. The pivot 11 for the carrier is so arranged that the truing tool extending .over the work and into position to en age the wheel, while the wheel is still in woriin The'parts are also so proportioned and arrangedthat the point of the truing tool lies? above the line drawn between the center of the pivot 11 and the center of the grinding wheel... By turning the adjusting screw 17,

ktherefore, the point of the-truing tool may be moved toward or away from the surface of the grinding wheel to regulate the action of the tool upon the wheel and to cause the tool to cut away the surface of the wheel to the desired extent. While the truing tool is in engagementwith the surface of the grinding wheel the bed 5 may be reciprocated manuall or by power, the movement of the bed in t e latter case being reversed by the operator to carry the truing tool back and forth across the surface of the wheel. After g relation to the work.

the wheel has beeh trued the truing tool carrier may be swung back into the full line alteration in the adjustment of the grinding wheel. The time lost in truing the grinding wheel is thus reduced to a minimum, with a corresponding increase in the production of the machine.-

While it is preferred to employ the specific construction and arrangement of the parts shown and described, it will be understood that this construction is not essential, and may be varied and modified without departing from the broader scope of the invention.

Having explained the nature and object of the invention, and specifically described one construction in which it may be embodied, What I claim is I 1. A mechanism for truing the wheels of grinding machines, having, 1n combination, a grinding wheel support and work supporting table relatively movable to transfer the point of operation along the work, work carrying centers on the work table and a truing tool holder having provision for engaging the truing tool with the grinding wheel while the grinding wheel is in grinda grindln wheel support and work supporting ta le relatively movable to transfer the polnt of operation of the grinding wheel along the work, work carrylng centers on the work table, a-truing tool carrier mounted on the work table, and means for adjusting the tool to true the wheel while the wheel is in grinding relation to the work carried by the centers.

' 3. A mechanism-'- for truing the wheels of grinding machines, having, 1n combination, a grinding wheelisupport and work support- :ing table relatively movable to transfer the point of operation of the grinding wheel along the work, work carrying centerson the work table, a truing tool carrier on the work supporting table mounted for movement into and out 0 working position, and means for actuating the carrier to move the truing tool toward or from the grinding wheel when the carrier is in wor position.

4. A mechanism or trui the wheels of grinding machines having, 1n combination,

a base, means for securing the base to the toward or from the grinding wheel wlien'the' Work supporting table of the grinding macarrier is in Working position.

chine, a truing tool carrier on the base mov- WILLIAM .S. DAVENPGRT. able into and out of Working position over Witnesses:

5 the Work supported on the Work carrying MARY L. SAWYER,

centers of the table, and an actuating device EDWARD T. BANNQN,

for operating the carrier to move the tool CHARLES T. SMITH. 

